<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div>哈哈</div>
    <script>
       
        const test = localStorage.getItem('test');

        if(test){
            document.querySelector('div').innerHTML = test
        }else{
            document.querySelector('div').innerHTML = '没有storege'
            localStorage.setItem('test', '123');
        }
    </script>
</body>
</html>